MetaFilter posts tagged with vitaminDhttp://www.metafilter.com/tags/vitaminD
Posts tagged with 'vitaminD' at MetaFilter.Sun, 26 Apr 2015 20:49:03 -0800Sun, 26 Apr 2015 20:49:03 -0800en-ushttp://blogs.law.harvard.edu/tech/rss60Eight thousand years of natural selection in Europehttp://www.metafilter.com/149175/Eight%2Dthousand%2Dyears%2Dof%2Dnatural%2Dselection%2Din%2DEurope
<a href="http://news.sciencemag.org/archaeology/2015/04/how-europeans-evolved-white-skin?utm_source=facebook&utm_medium=social&utm_campaign=facebook">How did Europeans become "white"?</a> see also:<a title="Iain Mathieson , Iosif Lazaridis , Nadin Rohland , Swapan Mallick , Bastien Llamas , Joseph Pickrell , Harald Meller , Manuel A. Rojo Guerra , Johannes Krause , David Anthony , Dorcas Brown , Carles Lalueza Fox , Alan Cooper , Kurt W. Alt , Wolfgang Haak , Nick Patterson , David Reich" href="http://biorxiv.org/content/early/2015/03/13/016477">Eight thousand years of natural selection in Europe</a> <blockquote>The arrival of farming in Europe beginning around 8,500 years ago required adaptation to new environments, pathogens, diets, and social organizations. While evidence of natural selection can be revealed by studying patterns of genetic variation in present-day people, these pattern are only indirect echoes of past events, and provide little information about where and when selection occurred. Ancient DNA makes it possible to examine populations as they were before, during and after adaptation events, and thus to reveal the tempo and mode of selection. Here we report the first genome-wide scan for selection using ancient DNA, based on 83 human samples from Holocene Europe analyzed at over 300,000 positions. </blockquote>
<a href="http://essays.backintyme.biz/item/332">Why Are Europeans White?</a> <blockquote>"White," of course, is a a social designation. The question really is, "Why are northern Europeans depigmented?" Here is a map of human skin tone. The natives of northern Europe are oddly light-skinned. They are paler than anyone else on earth.</blockquote> refers to <a href="http://essays.backintyme.biz/item/4">The Paleo-Etiology of Human Skin Tone</a> tag:metafilter.com,2015:site.149175Sun, 26 Apr 2015 20:49:03 -0800the man of twists and turnsYou Know Who Wears Sunglasses Inside?http://www.metafilter.com/147627/You%2DKnow%2DWho%2DWears%2DSunglasses%2DInside
We know that light affects our circadian rhythms and vitamin D levels. The wavelength or color of light matters at different times of day, as well as the amount we receive overall. But now we know that <a href="https://www.google.com/search?q=taking+melatonin&espvd=2&biw=1920&bih=943&tbm=shop&source=lnms&sa=X&ei=Wqf4VOy-HYKvggSzkoHgAg&ved=0CAcQ_AUoAQ&dpr=1#tbs=vw:l,price:1,ppr_min:3,ppr_max:10,cat:2227&tbm=shop&q=glasses+block+blue+light">blue-blocking glasses</a> really do <a href="http://www.lrc.rpi.edu/resources/newsroom/pdf/2012-2013/iPad8511.pdf">help increase melatonin levels</a> if worn at night before bed. Dr. Mariana Figueiro, program director at the <a href="http://www.lrc.rpi.edu/">Lighting Research Center at Rensselaer Polytechnic Institute</a>, says that they "need to remove transmission of light below 530 nm" to be effective. Blue light triggers us to be awake, but it isn't only reaching us from our <a href="http://www.theatlantic.com/health/archive/2015/02/how-smartphones-are-ruining-our-sleep/385792/">screens</a>. Though there are programs such as <a href="https://justgetflux.com/">f.lux</a> and <a href="https://launchpad.net/redshift">Redshift</a>, if you would like to address your screen's light.
If you'd like to get more blue light to combat <a href="http://www.cbc.ca/news/health/sad-science-why-winter-brings-us-down-but-won-t-for-long-1.2981920">Seasonal Affective Disorder</a> or to wake up less abruptly, there are <a href="http://www.usa.philips.com/c-m-pe/light-therapy/wake-up-light/latest#filters=WAKEUP_LIGHT_SU2%2CENERGYLIGHT_SU2&sliders=&support=&price=&priceBoxes=&page=&layout=12.subcategory.p-grid-icon">portable light boxes and gradually brightening lamps</a>. And now you can use also alternate your <a href="http://www.gelighting.com/LightingWeb/align/index.jsp">light bulbs</a> for different times of the day. Or wear <a href="http://re-timer.com/">a headset</a> that can shine light in your eyes.
You could also take <a href="http://sleepfoundation.org/sleep-topics/melatonin-and-sleep">melatonin</a> before bed. And vitamin D, but be careful about <a href="http://www.greatfallstribune.com/story/life/health-and-fitness/2015/03/02/lay-mega-doses-vitamin/24265487/">large doses</a>.
<a href="http://www.metafilter.com/130721/Red-Before-Bed-Better-for-Your-Head">Previously</a>. <a href="http://www.metafilter.com/135458/Your-favorite-blue-web-site-may-be-harming-your-health">Previously</a>. tag:metafilter.com,2015:site.147627Thu, 05 Mar 2015 12:37:46 -0800wendyfairyThe hobbit — an unexpected deficiencyhttp://www.metafilter.com/135018/The%2Dhobbit%2Dan%2Dunexpected%2Ddeficiency
<em>Vitamin D has been proposed to have beneficial effects in a wide range of contexts. We investigate the hypothesis that vitamin D deficiency, caused by both aversion to sunlight and unwholesome diet, could also be a significant contributor to the <a href="https://www.mja.com.au/journal/2013/199/11/hobbit-unexpected-deficiency">triumph of good over evil in fantasy literature. </a></em> tag:metafilter.com,2013:site.135018Sat, 21 Dec 2013 20:35:07 -0800ChrysostomYou may need more Vitamin D than you think.http://www.metafilter.com/61261/You%2Dmay%2Dneed%2Dmore%2DVitamin%2DD%2Dthan%2Dyou%2Dthink
New research suggests that taking vitamin D, preferably D3, may prevent <a href="http://ucsdnews.ucsd.edu/newsrel/health/vitamind07.asp">up to half of the cases of breast cancer and two-thirds of the cases of colorectal cancer in the United States</a>. Vitamin D3 is produced by your body when your skin is exposed to sunlight. (You can also get it from fatty fish, egg yolks, fortified milk and other products, and supplements. <a href="http://www.vrg.org/nutshell/faqingredients.htm#d3">D3 supplements are usually produced from lanolin</a>, so vegans will prefer D2.) <a href="http://www.cancer.ca/ccs/internet/mediareleaselist/0,3208,3172_615815452_1056572174_langId-en,00.html">This doesn't mean you should stop wearing sunscreen entirely</a> - white people exposed to summer sunlight in a bathing suit will produce all the <a href="http://www.cbc.ca/news/background/health/vitamin-d.html">vitamin D</a> they need in only 15 to 20 minutes, while darker-skinned people will need longer exposures (which <a href="http://www.news.harvard.edu/gazette/2007/03.22/01-vitaminD.html">might explain why black men have a higher incidence of prostate cancer</a>). Health Canada <a href="http://www.hc-sc.gc.ca/fn-an/food-guide-aliment/context/evid-fond/vita_d_e.html">now recommends all adults over the age of 50 take a daily vitamin D supplement of 10 micrograms (400 IU)</a>, and, because "vitamin D synthesis in the skin is absent during the winter months (October to March)," they note that Canadians (and, one assumes, other people in northern climates) must rely on dietary intake of vitamin D to maintain adequate levels of vitamin D in the body. tag:metafilter.com,2007:site.61261Thu, 17 May 2007 16:19:19 -0800joannemerriamVitamin D is not a vitamin but a hormonehttp://www.metafilter.com/42211/Vitamin%2DD%2Dis%2Dnot%2Da%2Dvitamin%2Dbut%2Da%2Dhormone
<a href="http://www.lovstrand.com/Quotes/Sunscreen.html">"...but trust me on the sunscreen."</a> That memorable, always-infallible commencement advice (<a href="http://www.snopes.com/quotes/vonnegut.htm">not</a> from Kurt Vonnegut) takes a hit as scientists now propose that we all need to get more direct sunlight, in order to... <small>wait for it...</small> <a href="http://msnbc.msn.com/ID/7875140/">fight cancer!</a> tag:metafilter.com,2005:site.42211Mon, 23 May 2005 11:11:52 -0800soyjoy